Length is how long is an object is. The standard mesurement are mm (millimeter), cm (centimeter), m (meter) and km (kilometer). The tools for measuring these are rulers, meter ruler and the tape measure.
Estimating is a educated guess to the amount of something is. If a person knows the length of a table is 4 sticks, then they can compare the sticks with a ruler. If they know how long the sticks are. They can make a estimation.
Converting is not easy. If a person wants to convert cm (centimeters) to mm (millimeter) just multiply the number by 10. If someone wants to convert cm (centimeters) to m (meter) just divide the number by 100.
Length can be estimated and coverted at the same time.
LI-To explore standard forms of length
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